Diagonal Initialization Line for Fingerprint Sensor Light Transmission
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Solution Overview
Problem
Display devices with embedded fingerprint sensors face challenges in maintaining the reliability of the fingerprint sensing function due to the need for a minimum width of openings in the circuit element layer to allow reflected light to reach the optical sensor, which can impact the device's thickness and manufacturing costs.
Innovation Solution
A display device design that includes a substrate with a pixel layer and a circuit element layer featuring a specific arrangement of semiconductor and conductive layers, including a first initialization line with diagonal and parallel portions, and a sensor layer with optical sensors to detect fingerprints, ensuring sufficient width for light transmission through openings in the circuit element layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening width in the circuit element layer is increased to ensure reliable fingerprint sensing, then the fingerprint sensing reliability is improved, but the device thickness increases
Solution Approach 1:
The patent transitions from a conventional straight-line initialization line to a multi-segmented line structure with diagonal portions. This dimensional change in the line configuration allows the initialization line to extend further across the display area without increasing the vertical thickness of the circuit element layer, thereby maintaining opening width for light transmission while ensuring proper initialization coverage.
Solution Approach 2:
The initialization line is divided into multiple segments including first, second, third, and fourth portions with different orientations. The third portion extends diagonally between the first and second portions, creating a segmented path that efficiently spans the required area. This segmentation allows the line to cover the necessary initialization zone without requiring a single long straight line that would increase device thickness.
2Measurement precision
If the opening width in the circuit element layer is increased to allow sufficient light transmission, then the fingerprint recognition accuracy is improved, but the manufacturing cost increases
Solution Approach 1:
The patent modifies the geometric parameters of the initialization line by introducing diagonal portions with specific orientation angles. This parameter change optimizes the line's spatial coverage efficiency, allowing the opening width to be reduced while still achieving complete initialization coverage. The optimized geometry enables smaller openings that maintain both manufacturing feasibility and sufficient light transmission for accurate fingerprint recognition.
3Area of stationary object
If the initialization line is extended to cover the entire display area, then the initialization coverage is improved, but the device complexity increases
Solution Approach 1:
The multi-segmented initialization line structure serves multiple functions simultaneously: it provides comprehensive initialization coverage across the display area, maintains acceptable opening widths for light transmission, and achieves these goals using a single continuous conductive layer pattern. This universal design eliminates the need for additional separate initialization structures or complex multi-layer configurations, thereby reducing overall device complexity while achieving extended coverage.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the reliability of fingerprint sensing by ensuring adequate light transmission through the openings in the circuit element layer, reducing the thickness and manufacturing costs of the display device while maintaining high fingerprint recognition accuracy.
Implementation Method 1
The optical sensor may acquire fingerprint information by receiving reflected light generated by a user's fingerprint
Implementation Method 2
A display device may include an opening, such as a pinhole, for controlling reflected light generated by a user's fingerprint so that it reaches an optical sensor
Data Source
AI summary
A display device includes a substrate and a pixel layer disposed on the substrate. The pixel layer includes a circuit element layer having an opening. The circuit element layer includes a first semiconductor layer and a first conductive layer that includes a first scan line pattern and an emission control line. A second conductive layer is disposed on the first conductive layer and includes a first initialization line, a second scan line pattern and a third scan line pattern. A second semiconductor layer is disposed on the second conductive layer. A third conductive layer is disposed on the second semiconductor layer and includes fourth and fifth scan line patterns. The first initialization line includes a first portion and a second portion each extending in a first direction, and a third portion disposed therebetween. The second portion extends diagonally with respect to the first direction.